function deleteLi(o){
    obj = o.parentElement;
    obj_str = obj.innerText;
    obj.parentElement.removeChild(obj);
    var ajaxObj = new XMLHttpRequest();
    // 以后地址和端口得改一改
    ajaxObj.open('get','http://127.0.0.1:8001/DelFollowerServletUrl/key='+obj_str,false);
    ajaxObj.send();
    location.reload();
}